Azo dyestuffs containing heavy metal



United States Patent .AZODYESTUFFS CONTAINING HEAVY METAL Werner Kuster, Basel, -Switzerland,-assignorto J. R; Geigy A.-'G., Basel, Switzerland No Drawing. Application June 18, 1956 SerialjNo. 592,471

Claims priority, application Switzerland June 23, 1955 6 Claims. (Cl. 260-146) The present inventionconcerns the production of azo t dyestuffs containinghea'vy metal as -well as the'usethereoffor'the fast dyeing-of natural and synthetic-polypeptide'fibres, and'finally, it concernsth'e material'fast dyed {with the aid of these dyestufis.

It has been found that valuable azo dyestuffs containing heavy metal are obtained if diazonium compounds of the benzene series which contain in the o-position to thediazonium group .a substituentcapable of taking part in the metal complex formation or a -substituent which can be converted into such a .groupand whichcontain no further acid water solubilising groups-apart from those taking part in the complex formationsuch as, for example the carboxyl and the sulphonic acid group, are coupled with 7'-hydroxynaphthazoles of the general For mula I and the monoazo dyestufifs so obtained are finally treated with agents giving off heavy metal.

In this formula X represents an oxygen or a sulphur atom and Y representsan oxygenatom or an NH-group.

7'-hydroxynaphthazoles corresponding to the general Formula I are 7-hydroxynaphthol'.2:4.5-oxazol0ne, 7'- hydroxynaphtho-l.2':4.5-imidazolone and the corresponding imidazole thion .and .oxazole .thion derivatives. The production of .theseeomg'aounds has already been described in the literature.

The usual Z-amino-l-carboxybenzene and, in particular the Z-amino-l-hydroxybenzene compounds are usable as diazo components according to the .present invention. These compounds may be --substituted, for example by halogen, alkyl, alkoxy, nitro, acylamino, alkyl or aryl sulphonyl, acyl, sulphonic .acid amide, .sulphonic acid-N- alkyl, N-hydroxyalkyl, -N-dialkyl, -N-aryl or -N- arylalkyl amide groups but they made not contain any sulphonic acid groups and carboxyl groups not taking part in the metal complex formation.

These compounds are diazotised and the diazonium compounds obtained arecoupledwiththegazo components usable according to the present invention 'by the usual methods which are known per se.

The monoazo dyestuifs obtained are metallised in aqueous or organic solution or suspension, advantageously while heating. Also they may be metallised in a melt of low fatty acid amides suchas, :for example, formamide, dimethyl formamide-oracetamide. In particular organic and inorganic salts and complex compounds of chromium and cobalt are used as agents giving .ofi heavy metal, for example chromic and cobalt acetate or sulphate, hexammine cobaltitiichloride or alkali or ammonium salts of chromosalicylic acid. The azo dyestuffs are so treated with such amounts of agents giving off heavy metal that there is at least one heavy metal atom to two inouoazo ice dyestu'fi molecules, carebeing taken towards the end of the metallisation to avoid a mineral acid'reaction of the medium. If desired, the metallised dyestuffs are finally converted into their alkali salts, for example into the lithium, sodium, potassium or ammonium salts. This is done by means of alkalies or saltshaving an alkaline reaction such as,for example potassium or sodium carbonate or'trisodium phosphate.

-The chromium and cobalt containing monoazo dyestuifs according to the :present invention dissolve in hot water and 'draw very well from a neutral to acid bath .onto natural and synthetic" polypeptide-fibres'such as wool, silk,- polyami'de and polyurethane fibres. They dyethese fibres 'in valuable grey, blue-grey to blue 'shades "which have good fastnessitoclight and milling.

The :following examples illustrate the invention with- .out limiting it in any way. Parts are given as parts by weight :and :the temperatures are in degrees centigrade. Therelationshippf parts by-weight to parts by volume is as that :of kilogrammesto litres.

EXAMPLE 1 20.1 parts of :Z-amino-l-hydroxybenzene-4-ethyl sulphoneare pasted in200 partsof water and 15 parts of concentrated hydrochloric acid :and diazotised at a tem' perature not exceeding 5 with-6.9 parts of sodium nitritein 35.,parts of water. On completion of thediazotisation, .the .mineralacid reaction of the diazonium suspension is buffered by the addition of sodium bicarbonate until congo red paper is no longer coloured blue. A solution 'of 20.6 parts of .7'-,hydroxynaphtho-1'.2:4.5- oxazolone and 4.1 parts of sodium hydroxide in 250 parts of water and .75parts .of pyridine is then poured into this .diazonium compound within half an hour. Duringnthe .coupling .the temperature should not exceed 5. The temperature of the mixture is allowed to rise overnight to 20, then the completely formed dyestuff is drawn off under suction and washed with 5% sodium chloride solution.

The-chromium containing dyestuff is produced according .tolthe following method:

The filter cakes of the coupling are pasted in 1000 parts of water and 10 parts of 25% ammouiaand then, at 80, 100 parts by volume of a solution of ammonium disalicylato chrorniate,corresponding to 3 parts of chromium, are added and the whole is heated for 6-8 hours at 95-100". '80 parts of sodium chloride are added, the

complexchromium compound which has practically completely precipitated is filtered off at 70, washed with 5% sodium'chloride solution and dried.

The chromium containing dyestuff is ablack powder which dissolves in hot Water with a blue grey and in concentrated sulphuric acid with a violet colour. 'It dyes wool from a neutral to weakly acid bath in blue-grey shades. The wool dyeings are fast to light and have very good Wet fastness properties.

The cobalt containing dyestuif is produced as follows:

The filter cakes of the coupling according to paragraph ;1 are pasted in 1000 parts of water and 10 parts of 25% ammonia. 1001parts by volume of an aqueous solution of cobalt acetate, corresponding to 3.5 parts of cobalt, are added at The whole is then kept for 6 hours at "9'5100 whereupon the reaction is made weakly alkaline with some sodium bicarbonate. The cobalt containing dyestufi is precipitated by the addition of parts'of sodium chloride, filtered oif at 80, washed :with 5% sodium chloride solution and dried."

It .is .a .dark, brown viole't :powder which dissolves :in hot water with a violet and :in concentrated sulphuric acid 'with a red-violet colour. It'dye's wool from' a neutral to weakly acid bath in brown-violet shades which v have-very good iast-ness properties.

26.4 parts of Z-amino-1-hydroxybenzene-4-sulphonic acid phenylamide are dissolved with 4 parts of sodium hydroxide in 200 parts of water. A solution of 6.9 parts of sodium nitrite in 40 parts of water is then added and the mixture is added dropwise at a temperature not exceeding 5 to 25' parts by volume of concentrated hydrochloric acid and 100 parts of water- On completion of the diazotisation, the acidity of the diazo suspension is buffered with sodium bicarbonate until congo red paper is no longer coloured blue whereupon a solution of 21 parts of 7-hydroxynaphtho-1.2':4.5-oxazolone and 4.1 parts of sodium hydroxide in 250 parts of water and 75 parts of pyridine is added. The temperature of the mixture is allowed to rise overnight from 5 to The completely formed dyestufi is separated by the addi' tion of 30 parts of sodium chloride, filtered off and washed with 5% sodium chloride solution.

The chromium containing dyestutf is produced as follows.

The filter cakes of the coupling are pasted in 1000 parts of water and 10 parts of ammonia; 100 parts by volume of a solution of ammonium disalicylato chromiate, corresponding to 3 parts of chromium, are added at 80 and the whole is heated for 67 hours at 95-100. 40 parts of sodium chloride are'then added and the practically completely precipitated chromium compound of the dyestutf is filtered off at 80, washed with 5% sodium chloride solution and dried.

The chromium containing dyestuff is a grey-black powder which dissolves in hot water with a reddish-grey and in concentrated sulphuric acid with a red-violet colour. It dyes wool from a neutral to weakly acid bath in grey shades which have very good wet andlight fastness properties.

In the following table further valuable metal containing dyestuffs according to the present invention are listed which are obtained by using the methods described in Examples 1 and 2.

Table Shade of Diem component Coupling component Metal dyeinglon woo 2-arnino-l-hydroxyben- 7-hydroxynaphtho-l.2z Cr grey.

zene-t'sulphonie acid 4.5oxazolono. methyl amide.

Do 7'-hydrox,vnaphtho-l.2: Cr blue-grey.

4.5-irnidazolone. Do 7-hydroxynaphtho-1.2': G1 reddish- 4.5-o.\'azole thion. grey. z-amino-l-hydroxyben- 7-hydroxynaphtho-1.2': Cr grey.

zene-Q-sulphonic acid 4.5-oxazolonc. dimethyl amide.

Do do Co brownviolet. 2-amlno-1-hydroxybendo Or grey-blue.

zeue-5-sulphonic acid methylarnide.

Do 7-hydroxynaphtho-1.2: 0r blue.

4.5-imidazolone. 2-amino-1-hydroxyben- ..do Cr grey-blue.

zene-i-ehloromethyl sulphone.

Do 7'-hydroxynaphtho-l'.2': Cr reddish- 4.5-oxazolono. grey. Do .d0 Co brownviolet Do 7-hydroxynaphtho-l.2: Gr reddish- 4.5-oxazole thion. grey. 4'chloro'5-nitro-2 7-hy droxynaphtho-l .2 Cr greenishamlno-l-hydroxyben- 4.5-0xazoloue. blue zene. 6-nitro-2'amino-1- 00 blue hydroxybenzene. Mhloro-Z-amino-l- Cr bluehydroxybenzene. violet 4-chloro-5-nltro-2- 7-hydroxynaphtho-l'.2: 00 no.

amino-l-hydroxyben- 4.5-oxazo1one. zone. 5-nitro-2-amino-1- 7-hydroxynaphtho-1'.2': Co greenishhydroxybeuzene. 4.5-lmidazolone. blue.

5-chloro-2-amtno-1- 7-hydroxynaphtho-1'.2: Co violet.

hydroxybenzene. 4.6oxaaolone. Mmlno-l-hydroxybendo 00 bluelsh- [6116'4'8I11Dh0fl10 acid violet. phenylamlda.

4 EXAMPLE 3 10 parts of previously wetted wool are entered at 40 into :a dyebath containing in 400 parts of water, 0.2 part of the chromium containing dyestuff according to Example 2, 1 part of anhydrous sodium sulphate and 0.3 part of ammonium acetate. The bath is brought to the boil and kept boiling until the liquor is practically exhausted, which is for about ,1 hour. The wool which has been dyed a strong grey colour is rinsed and dried. A reddish-grey wool dyeing is obtained which has very good wet and light fastness properties.

Wool dycings of the metal containing dyestuffs according to the other example and the table are obtained in a similar manner.

What I claim is:

l. A metalliferous compound which contains one atom of a metal selected from the group consisting of cobalt and chromium in complex union with two molecules of a monoazo dyestuff which is free from sulphonic and carboxylic acid groups and corresponds to the formula:

on AN=N-'B wherein A represents a mononuclear radical of the benzene series bound to the azo group in ortho-position to the hydroxyl group, and B represents a member selected from the group consisting of:

on OH EN EN!- %0 C-IL H o and 2. The complex chromium compound which contains one atom of chromium bound in complex union to two molecules of a dyestufi of the formula:

?H OH EN 0. i- 1 5 g 3. The complex chromium compound which contains one atom of chromium bound in complex union to two molecules of a dyestutf of the formula:

OH DE 4. The complex chromium compound which contains one atom of chromium bound in complex union to two molecules of a dyestufi of the formula:

OH OH ml:- 0: c& 10

6. The complex cobalt compound which contains one atom of cobalt bound in complex union to two molecules of a dyestuif of the formula:

References Cited in the file of this patent UNITED STATES PATENTS Ballauf Sept. 29, 1936 OTHER REFERENCES Venkataraman: Synthetic Dyes, 1952, page 540.

OaN 

1. A METALLIFEROUS COMPOUND WHICH CONTAINS ONE ATOM OF A METAL SELECTED FROM THE GROUP CONSISTING OF COBALT AND CHROMIUM IN COMPLEX UNION WITH TWO MOLECULES OF A MONOAZO DYESTUFF WHICH IS FREE FROM SULPHONIC AND CARBOXYLIC ACIDS GROUPS AND CORRESPONDS TO THE FORMULA: 